Light source comprising a luminescent substance and associated illumination unit

US9761767B2 · kind B2 · utility

Assignees

• OSRAM Opto Semiconductors GmbH · DE
• OSRAM GmbH · DE

Inventors

• Barbara Huckenbeck · Augsburg, DE
• Hailing Cui · Regensburg, DE
• Frank Jermann · Königsbrunn, DE

Key dates

• Filing date: Sep 5, 2012
• Grant date: Sep 12, 2017
• Expiry date: Jul 22, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/73265
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A light source includes a primary radiation source, which emits radiation in the shortwave range of the optical spectral range, wherein this radiation is converted at least by means of a first luminescent substance entirely or partially into secondary longer-wave radiation in the visible spectral range, wherein the first luminescent substance originates from the class of nitridic modified orthosilicates (NOS), wherein the luminescent substance has as a component M predominantly the group EA=Sr, Ba, Ca, or Mg alone or in combination, wherein the activating dopant D is composed at least of Eu and replaces a proportion of M, and wherein a proportion of SiO2 is introduced in deficiency, so that a modified sub-stoichiometric orthosilicate is provided, wherein the orthosilicate is an orthosilicate stabilized with RE and N, where RE=rare earth metal.